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This actually sounds like your motor is not the problem it sounds asthougth your transmission is in need of work. if you have flushed your system also may look at your oil pump system as the change in pitch of the road to climb hills may infact be pulling sludge against the sump tube screen and plugging the oil pump. these are the only two reasons I can see for this to happen if system only dose this when climbing a hill.

Had same problem on my 94 eldorado touring and it turned out I had bad ign coil. This sets a 41 code. Check codes for no cam ref signal. Sounds stupid but if one coil stops firing on only one cyl it sets that code. There are 4 coils and they run 2 of one end of ign module and two of other end.

I doubt the Sea Foam had anything to do with that. I'd check for a vacuum hose off, especially by the PCV valve. Maybe a broken hose or the PCV valve itself might be stuck. Maybe just put a new one in, they are not that spendy. No vacuum would explain the brakes not working.